At the beginning of this year, YouTube had more than 200 million views on mobile devices per day. Now, it's more than 400 million.

That's more than 10% of the total views on the site, which amount to more than three billion.

Today's revamp of YouTube, which focuses the site on channels rather than individual videos, applies only to the Web and new Xbox version of YouTube for now. But spokespeople hinted that the changes will be coming to mobile platforms soon.

One obvious scenario would be to let users "pin" individual channels to the home screen of Android phones and tablets, so rather than opening the app, they could go straight to the channel they want to watch.